frivolous meaning
EN
[ˈfɹɪv.əl.əs] 
US - AdjectiveCOMmore frivolousSUPmost frivolousSUF-ous
- Silly, especially at an inappropriate time or in an inappropriate manner.
- There is no easy definition for the phrase 'frivolous lawsuit,' but I imagine any claim for damages where the injuries are minimal or where the basis for the defendant's liability is hard to believe, might qualify as frivolous.
- Of little weight or importance; not worth notice; slight.
- (law) In litigation, a lawsuit filed by a party who is aware the claim is without merit and has no reasonable prospect of success because of a lack of supporting legal or factual basis.
- Silly, especially at an inappropriate time or in an inappropriate manner.
Definition of frivolous in English Dictionary
- Part-of-Speech Hierarchy
- Adjectives
- Adjectives
Source: Wiktionary
Grammatically, this word "frivolous" is an adjective.